I am reading through a QOS Document and they want me to trust the DSCP value from an IP phone (Siemens) but UN trust the PC DSCP value. How can I trust one thing but not the other? I am using a 2960 Cisco switch with IP base IOS.
View 2 Repliesi have Catalyst2950SI with iOS12.1, connect a wifi-access-point to f1/1(dot1q trunk port),and connect another L2SW to f1/2(dot1q trunk port),and IP phone, MobileCamera connects to wifi-access-point,IP phone has dscp=40 value on its own packet,but MobileCamera doesn't have any dscp value or cos.now, i wanna do QoS by that dscp, So i type as below,
interface 1/1
switchport mode trunk
mls qos trust dscp
interface 1/2
switchport mode trunk
mls qos trust cos
i would like to know the possibility to use mls qos trust dscp with service-policy in the IOS ver.12.2(25)SEE2.The specific version is not possible to configure like below.
Cat3750(config-if)#do sh run int f1/0/1
Building configuration...
[code]....
I have some 2960 switches with Lan Lite ios in my infrastructure.And I try to configure them to support "trust device cisco-phone" and "switchport priority extend cos 0" on ports with cisco phones.But LAN Lite image does not support "mls qos trust device cisco-phone".can I use any workaround to trust cos of cisco phone and to remark PC traffic with cos 0?
View 1 Replies View RelatedI have a problem with the command mls qos trust dscp, I used the ios c2800nm-ipvoice_ivs-mz.124-25f.bin but i can not enable dont show me the complete command in the interface Ethernet o Giga. I want to configuring mls qos trust dscp.
View 1 Replies View RelatedI want to know what the default behavior about the command 'mls qos trust dscp' under router platform interface. the router is ASR1000 series.we don't need to put above command line to trust dscp in case of router? otherwise, we have to add it as welll as like switch platform.
View 4 Replies View RelatedI have a question which i am unsure of, on the 6500 i know i can set mls qos trust to cos or dscp since I don't have any trunks configured on that switch that i want to trust cos most of my ports trust dscp instead. The question is will packets coming in or going out at L3 with the TOS bits set get placed in the correct in/out queue. For example if a packet comes in on a port with a mls qos trust dscp and has the TOS set to XX will this XX get mapped to the correct COS value based on the default dscp to cos map and end up going out the correct queue which handles that specific COS number?
I mainly asked this because i saw the following on the cisco site and again i am suing dscp trust and not cos.
Weighted Round Robin (WRR), Deficit Weighted Round Robin (DWRR) and Shaped Round Robin (SRR). WRED and all the Round Robin scheduling options use the priority tag (CoS) inside an Ethernet frame to provide enhanced buffer management and outbound scheduling.
We have QoS configured throughout the company, but the standard config we have applied across the 3750 switches only includes the below: We have IP phones (not cisco) attached that are marking with EF, and the PC is an untrusted end device (so needs to be by default marked as zero).Is the above enough to trust VOIP DSCP EF without resetting it to DSCP 0, or do I also need to add a trust line (i.e.: mls qos trust dscp)?
View 2 Replies View RelatedAre there any differences between the autoqos commands on a WS-C2960S switches (or in any other series)? Follow the commands:
- auto qos trust
- auto qos voip trust
I was checking the documentation on this link:
URL
And couldn't find any great difference between the two commands, as far as I could see they'll set the Ingress and Egress queues the same way.
Are there any differences between those two commands (auto qos trust and auto qos voip trust)? If so, when should I use one and the other?
I've just been testing QOS on 3560 with version 15.0(1) and it seems the the default qos trust behavior on access ports has changed. By default the trust state of a port is not to trust anything, however rather than rewriting the DSCP value of the incoming packets and settign it to 0 the switch now seems to leave the DSCP value unchanged.
SW04-C3560(config)# do sh mls qos int g0/2
GigabitEthernet0/2
trust state: not trusted
trust mode: not trusted
trust enabled flag: ena
[Code]......
How can I configure Cisco 200 (SG200-08P) to learn Voice VLAN and CoS/DSCP from upstreamCatalyst 2960?
The Cat 2960 is today used together with LLDP-MED to announce config to Aastra IP Telephones. In some cases I need to use a small switch inbetween and plan to use the Cisco SG200-08P for this. However, I would like to avoid manual config of the Cisco 200 switch.
I am getting a very strange problem where 4500 switch is remarking the packet with dscp 1 to 0.
Let me explaint the setup. I have two PCs connected on same switch but on different modules. PC1 is conencted to Gi4/19 and PC2 is connected to
Gi2/43. Both the ports has been configured to trust the dscp. Below are the configuration:
interface GigabitEthernet4/19
switchport access vlan 6
switchport mode access
[Code].....
i did on cisco 2960S switch at user ingress interface. but the marking is not showing in show policy-map interface gig 1/0/10 interface and ACL is not showing any match.
I also had a config reference from 2960S cisco guide.
access-list 103 permit tcp any any eq 80
access-list 104 permit tcp any any eq 23
access-list 105 permit icmp host 172.24.68.4 any
class-map IN_HTTP
match access-group 103
class-map IN_TELNET
match access-group 104(code)
I have a pair of Nexus 7K's running 5.1(3). I have a handful of edge devices that I need to mark ingress traffic, and need to mark both DSCP and CoS. Right now, I have a working config that marks DSCP appropriately.While that works dor DSCP, the MQC will not allow me to mark both DSCP and COS in the same class, and unlike IOS, it appears that Nexus does not have a default DSCP-to-COS mapping. My understanding is this can be solved using table maps, but I don't see how that can solve my problem in this specific scenario (it appears I can do marking or table-map mutation, but not both?). How I can accomplish both?
View 5 Replies View Relatedthere is something I find strange on C6500 about QoS: C6500 derive an internal DSCP value for it's internal use, but when configuring the qos mapping on output interfaces, only a cos value (I guess, an internal cos value) can be used. Is it a misunderstanding from me, or is it really illogic?
View 2 Replies View RelatedI've been working on a 3560 that doesn't seem to map dscp values to a new value: mls qos map dscp-mutation ToR1 22 24 to 46
[Code]....
On the router on the other side, I created an acl that matched on dscp 46, but it doesn't match on it. I've tried moving the mutation map to the ingress interface and I've tried setting dscp with a service policy instead of marking COS and using internal dscp. Where is the mutation map supposed to be placed: ingress or egress? Also, I added an entry in the acl on the router to see if I was mapping to dscp 24, and I am:
[Code]....
So it seems like the mutation map is being ignored completely. Any reason why?
I have a problem with dscp preservation on a WS-C3750X-48 catalyst; in my little diagram, his name will be SW2, so I have this:SW1 <-> SW2 <-> RT1. some phone connected to SW1 mark with dscp EF (46) the voice traffic.The "mls qos" was enabled on SW1 and SWt. The interlink switch ports has the "mls qos trust dscp" option, the phone port and the router port also.And the problem is I can see the dscp marking on the SW2 when I span the voice vlan on this switch but the dscp was removed ( DSCP set to 0) on the router port ( span on the router port for look )If I made also a packet capture on the router RT1, I see the DSCP was effectively reset to zero.If I disable the "mls qos" on SW2, of course all is fine and the dscp was preserved and forwarded to the router. [code]
View 2 Replies View RelatedI am trying to mark http packets from a web server with DSCP ef, but when I am doing a traffic capture all http packets have tos 0x0.I am able to mark UDP and ICMP packets originated from this server, but not any TCP traffic.The web server is in VLAN 20This is my config mls qos ip access-list extended MARK-HTTP-ACL permit tcp host 10.10.10.10 eq www. [code]
View 4 Replies View RelatedI'm working on a catalyst c3750 and for my work i need to prioritize certain streams independent of their bandwith usage.
The streams are the following:
- voice
- video
- data
I created policy maps based on vlans like below:
policy-map VOICE
class class-default
set precedence 5
policy-map VIDEO
[Code]...
I am begining to work to apply Qos on switchs (C2960 & C6500), and I still have a doubt about the necessity to consider the cos value. I indeed want to apply Qos for ToIP, Video, perhaps create a scavenger class, ans in all cases, I classify my packets with TCP/UDPB port and mark them with DSCP. So is it really necessary to study all the DSCP/CoS mapping problematics ? Is it not possible to make the configurations only on the base of the DSCP field?
View 3 Replies View RelatedWhen configuring QoS on 3750s/3560s, we're mapping packets to particular interface output queues with commands such as: [code] The command to see what's actually being enqueued, dropped, etc. is: [code]
Note that these queues are numbered 0 - 3, and not 1 - 4. We've been assuming that the first queue number in the "mls qos" (i.e., 1) command maps to the first queue (i.e., 0) in the "show mls qos" command.
I have a Nexus 5500 which is the core of our network and we have access layer switches uplinked to it. I know by default the qos markings will be trusted.
1. On a trunk uplink from an access layer switch to the Nexus, I have "mls qos trust dscp". Will the DSCP marking be preserved when it reaches the Nexus?
2. How do I do prioritization of voice traffic on an uplink on Nexus based on DSCP EF?
I have an existing stack of 4 x 2960-S switches connected by stack cables.I would like to add another 2960-S switch to the stack but am unable to as the 2960-S will only allow 4 x 2960-S switches per stack.how I would add the 5th 2960-S switch to the existing stack of 4 x 2960-S switches.
View 12 Replies View RelatedI have a 24 port 2960-S that is not communicating with a 2960-LST that it is directly connected to over fiber. The link is up on the LST but will not come up on the -S. What command should I use to bring up this link? I have tried no shut from the (Config-if)# prompt.
View 3 Replies View RelatedI have made some test and i noticed that qos input policy does not classify the icmp packet based on their dscp.The "match dscp ef" or "match precedence 5" is not working only the "match protocol icmp" shows hits.
We need to classify the different icmp packets based on dscp ( TOS ) for measurement purpose.CISCO 7200, 12.4.25d and 12.4.20T have a same behavior.
How the dscp-cos or cos-dscp mapping takes place in c892 router? There is no command like "sh mls qos maps" in c892 like we have in c2951 or c3925.
View 3 Replies View RelatedMy management has tasked me to give them a high level overview of the different switching we can choose for our new building.
This is what I know so far.4 Closets, each closet has 450 ports,One MDF room that is will contain one UCS Chassis and a Nimble iSCSI SAN.
I am working on the spreadsheet and it looks like this (Not totally filled):
2960s3560x3750x45064510Approx cost (Each, 48PORT, POE+, 10G uplink, Dual PS, IP BASE)
6K7K8K45K75KMax Capacity192432432192384Backplane speed206464520520ProLeast ExpensiveStackable to 9Stackable to 9ProDual PSDual PSDual PSDual PSDual PSProLayer 3 opt
Layer 3 optDual SupsDual SupsConExpensiveExpensiveConNo Dual PSConLayer 2 OnlyCannot stack more than 4
For the MDF I would like to use 2 Nexus 5548's with FEX's, and the layer 3 daughter board. For the IDF's I was thinking of two 4010's.
I am using a 3750 as a default gateway for multiple Vlans on a few 2960 switches. The trunk lines are configured and working and I have assigned ip addresses to each of the Vlan interfaces on the 3750. My issue is that I can only ping the ip address on the Vlan interface of the 3750 if I have a working computer plugged directly into the Vlan on the 3750. I only have 3 vlans on the 3750 that have hosts directly connected (vlans 2, 10 and 40) the other vlans ( 20 and 70) don't have any clients plugged into them on the 3750 but the hosts reside on 2 different 2960s that connect via trunk ports. How do I keep the vlan interface on the 3750 switch pingable when I don't have hosts directly connected in that vlan on the 3750? (yes, I have enabled ip routing on the 3750)
View 5 Replies View RelatedI have a Cisco SG 300-20 as the core switch, layer 3. It is 192.168.4.6 on VLAN1 and 192.168.5.1 for VLAN2 (VOIP). All the ports are set in trunk mode. DHCP relay is setup on this switch.
The phones connected into a layer 2, Catalyst 2960-S switch. All ports are set in trunk mode. Default gateway on it is set to 192.168.5.1.
DHCP for both VLANs is provided by a Windows Server 2008 R2 server (the relay IP 192.168.4.15).
There is also an ASA 5510 in the mix which is 192.168.4.1. It has a route added to it for the 192.168.5.0 network to go to the SG 300 (192.168.5.1).
Just the two switches can ping each other on the 192.168.5.x network when I "add vlan 2" to the trunk port that is connected between the SG 300 and the 2960. The phones don't get DHCP on the 2960 switch. And I cannot ping 192.168.5.x from the ASA or anything else on the 192.168.4.x network.
After a bit of reading on intra-vlan routing for the SG 300 switch, I am thinking the SG 300 has to be the "center" of things so I need to make it 192.168.4.1 to be the gateway for both VLANs and change the ASA to 192.168.4.2 for VLAN1, etc. And I really can't do asymmetric routing with this switch.
Does the Model "WS-C2960-24PC-L" Supports IP Routing or not?
View 9 Replies View RelatedI have a 3750G switch running 12.2(44)SE6 my customer has some Cisco EX90 and ex-Tandberg VC units connected to the switch in a dedicated VLAN 600. The switch is then connected to the WAN router which has its own VLAN 6
From sh mls qos interface x/x/x statistics I can see that the traffic is marked by the VC units as DSCP 34 however when I run this command on the interface to the CE router the marking has been lost.
Similarly in the opposite direction incoming from the CE router I can see the marking coming from across the MPLS ok but when I check the output to the VC unit the marking has been lost.
This would indicate that in the process of routing between VLAN's the DSCP marking has been lost.
how to correct this issue. Because my interfaces are in different VLAN's do I need to VLAN based QoS?
I'm having a strange problem where I'm not able to get through a Cisco 2960-S L2 switch when connected through vpn, while LAN-WAN traffic is working fine.The situation on site is the following:When inside the network I'm able to get to the internet without a problem. The problem is within a vpn-session. When this session is succesfully started I can ping and manage the Cisco 2960-S switch, but I can't ping or manage the Dell switch from my laptop. I can however ping the Dell from the Cisco-switch. [code]
View 7 Replies View Relatedset up my QoS on two 2960
-------------------- ------- ------- ------------
PBX Asterisk |----|2960-1 |------|2960-2 |-----|Voip client2|
-------------------- ------- ------- ------------
-------------- |
[Code].....
This will be this configuration for all input interface right ? For the Output part I'm lost, what do I have to do ? And for the 2960-2 do I have to put the same configuration ?